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Last Word

Neon Welcome signboard retro style, Toilet sign with boy, girl figure. Glowing inscription on dark red brick background. Suitable for night outdoor banner, advertisement, shop, night club. 3D render.; Shutterstock ID 2265283835; purchase_order: -; job: -; client: -; other:

Do you wake up needing to pee, or need to pee because you’ve woken up?

At night, the brain and bladder are debating whether to get you up or let you rest, explains one reader, and it’s usually the bladder that calls the shots

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Child's Spinning Top Toy; Shutterstock ID 365058569; purchase_order: -; job: -; client: -; other:

What would happen if a spinning disc neared the speed of light? Part 2

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Leopard gecko lizards on the rock, cute lizards that are easy to care for, eublepharis macularius, animal closeup; Shutterstock ID 2551815383; purchase_order: -; job: -; client: -; other: -

Which animals can recognise individual people? Part 2

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Planet in water - Moon. Science fiction art. Solar system. Elements of this image furnished by NASA; Shutterstock ID 579784837; purchase_order: -; job: -; client: -; other:

This week’s new questions

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Child's Spinning Top Toy; Shutterstock ID 365058569; purchase_order: -; job: -; client: -; other:

What would happen if a spinning disc approached the speed of light?

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CHEETAH acinonyx jubatus, Adult running through Savannah ; Shutterstock ID 1652757304; purchase_order: -; job: -; client: -; other:

Must the evolution of an adapted trait in nature reach a limit? Part 2

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2CA4Y7K Comet crashing into earth

How would we spot an antimatter comet in our solar system? Part 2

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cofee cup on the sand at the sunset; Shutterstock ID 1450632401; purchase_order: -; job: -; client: -; other:

This week’s new questions

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CHEETAH acinonyx jubatus, Adult running through Savannah ; Shutterstock ID 1652757304; purchase_order: -; job: -; client: -; other:

Must the evolution of any adapted trait in nature reach a limit?

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2CA4Y7K Comet crashing into earth

If an antimatter meteor came into our solar system, how would we know?

If an antimatter meteor came into our solar system, we’d definitely know about it, says one reader, especially if it hit the sun

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Should bubble wrap face the inside or outside of the object? Part 2

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This week’s new questions

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How do you get the most clothes into a suitcase?

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What happens if an entangled particle falls into a black hole?

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